How to fix Cannot render null or undefined directly in React in React

// Wrong
function MyComponent({ shouldRender }) {
  if (shouldRender) {
    return <div>Content</div>;
  }
  // Missing return or returns undefined
}

// Correct
function MyComponent({ shouldRender }) {
  if (shouldRender) {
    return <div>Content</div>;
  }
  return null; // Explicitly return null
}

// Wrong
function Component({ show }) {
  return (
    <div>
      {show && <p>Only shown when true</p>}
      {show ? <p>Shown</p> : undefined} {/* undefined causes error */}
    </div>
  );
}

// Correct
function Component({ show }) {
  return (
    <div>
      {show && <p>Only shown when true</p>}
      {show ? <p>Shown</p> : null}
    </div>
  );
}

// Wrong - some paths return nothing
function UserCard({ user }) {
  if (!user) {
    return null;
  }
  if (user.banned) {
    return <div>User is banned</div>;
  }
  // Missing else: might return undefined
}

// Correct - all paths have returns
function UserCard({ user }) {
  if (!user) {
    return null;
  }
  if (user.banned) {
    return <div>User is banned</div>;
  }
  return <div>Welcome, {user.name}</div>;
}

// Safe - && operator handles false correctly
function Alert({ message, type }) {
  return (
    <div>
      {type === 'error' && <p className='error'>{message}</p>}
      {/* If condition is false, nothing renders */}
    </div>
  );
}

{
  "dependencies": {
    "react": "^18.0.0",
    "react-dom": "^18.0.0"
  }
}